'use strict';
var _  = require("lodash");
_.mixin({
    isAarryLike:function(obj){
        if(_.isNull(obj) || _.isUndefined(obj)){
            return false;
        }
        var length = obj.length;

        return length === 0 ||
            (_.isNumber(length) && length > 0 && (length -1) in obj);
    }
});

var myString ="3+ 4";
var ch = myString.charAt(2);
console.log(ch);